MFC-9450CDN FAQs & Troubleshooting MFC-9450CDN Not your product? Sort by: Updated Date Popularity 3 Results 1. 03/30/2007 How do I install the Optional Tray Unit? 2. 03/26/2007 What kind of memory can I use? 3. 02/27/2007 How do I install additional memory? Consumables / Paper / Accessories FAQs & Troubleshooting